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Sugilite and Chalcedony Optical Properties


Chalcedony and Sugilite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
Weak   
AbsentWalter Schumann   

Dispersion
Not Available   
None   

Transparency
Translucent   
Translucent, Translucent to opaque   

Refractive Index
1.607-1.612   
1.530-1.543   

Optic Character
Not Available   
Not Available   

Crystal System
Hexagonal   
Trigonal   

Birefringence
0.003   
0.003-0.009   

Clarity
Translucent   
Translucent   

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Sugilite and Chalcedony Optic Character

Sugilite and Chalcedony optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Sugilite and Chalcedony Physical Properties like crystallographic symmetry, pleochroism,etc. in the crystal. Some of the optical properties are refractive index, luster, optic character, pleochroism etc. Prominent among these is Sugilite and Chalcedony optic character. You might have noticed your gemologist rotating the gemstone while testing it. Rotating a gemstone along its optic axis helps in determining its optic character.

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Sugilite and Chalcedony Transparency

Similar to their colors, Sugilite and Chalcedony transparency can also be used as criteria for their primary identification. Although transparency cannot be the only criteria for gemstone identification, it can efficiently used in gemstone grading. Talking about their transparency, Sugilite is Translucent while Sugilite is Translucent in appearance.

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